An electron spectroscopic analyzer using X-rays is provided. The electron spectroscopic analyzer includes an X-ray generator for generating X-rays, an optical system for detecting charged particles emitted from an object irradiated with the X-rays to analyze the object, a vacuum system whose inside is maintained at a low pressure near to vacuum pressure, the vacuum system being provided between the X-ray generator and the optical system, and a blocking unit provided between the X-ray generator and the optical system for preventing elements other than the X-rays emitted from the X-ray generator from flowing into the optical system.